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Commercial Mortgage Banking - Schedule of Amortization Expense (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Servicing Asset at Amortized Cost [Line Items]
2014	$ 3,565
2015	3,565
2016	3,565
2017	3,537
2018	3,485
Thereafter	11,162
Amortization expense	28,879
Originated MSRs [Member]
Servicing Asset at Amortized Cost [Line Items]
2014	2,299
2015	2,299
2016	2,299
2017	2,293
2018	2,273
Thereafter	7,670
Amortization expense	19,133
Purchased MSRs [Member]
Servicing Asset at Amortized Cost [Line Items]
2014	1,266
2015	1,266
2016	1,266
2017	1,244
2018	1,212
Thereafter	3,492
Amortization expense	$ 9,746

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Amount of amortization expense expected to be recognized after the fifth fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense expected to be recognized during the next fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense expected to be recognized during the fourth fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense expected to be recognized during the third fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense expected to be recognized during the second fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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